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JaVers - object auditing and diff framework for Java
package org.javers.core.metamodel.object;
import org.javers.common.collections.Arrays;
import org.javers.common.exception.JaversException;
import org.javers.common.exception.JaversExceptionCode;
import org.javers.common.validation.Validate;
import org.javers.core.metamodel.type.*;
import java.util.LinkedList;
/**
* @author bartosz.walacik
*/
class GlobalIdPathParser {
private final TypeMapper typeMapper;
public GlobalIdPathParser(TypeMapper typeMapper) {
this.typeMapper = typeMapper;
}
ValueObjectType parseChildValueObject(ManagedType ownerType, String path){
return parseChildValueObjectFromPathSegments(ownerType, pathToSegments(path), path);
}
private ValueObjectType parseChildValueObjectFromPathSegments(ManagedType ownerType, LinkedList segments, String path) {
JaversProperty property = ownerType.getProperty(segments.getFirst());
ValueObjectType childVoType = extractChildValueObject(property.getType(), path);
if (segments.size() == 1 ||
segments.size() == 2 && property.getType() instanceof EnumerableType){
return childVoType;
}
segments.removeFirst();
if (property.getType() instanceof EnumerableType){
segments.removeFirst(); //removing segment with list index or map key
}
return parseChildValueObjectFromPathSegments(childVoType, segments, path);
}
private ValueObjectType extractChildValueObject(JaversType voPropertyType, String path) {
if (voPropertyType instanceof ValueObjectType) {
return (ValueObjectType) voPropertyType;
}
if (voPropertyType instanceof ContainerType) {
JaversType contentType = typeMapper.getJaversType(((ContainerType) voPropertyType).getItemType());
if (contentType instanceof ValueObjectType){
return (ValueObjectType)contentType;
}
}
if (voPropertyType instanceof MapType){
JaversType valueType = typeMapper.getJaversType(((MapType) voPropertyType).getValueType());
if (valueType instanceof ValueObjectType){
return (ValueObjectType)valueType;
}
}
throw new JaversException(JaversExceptionCode.CANT_EXTRACT_CHILD_VALUE_OBJECT,
path, voPropertyType);
}
private LinkedList pathToSegments(String path){
Validate.argumentIsNotNull(path);
return new LinkedList(Arrays.asList(path.split("/")));
}
}